本文对无单放货产生的原因、风险防范等进行了分析，并提出了防范无单放货的具体措施。

In this paper, the causes of non-delivery of goods, and risk prevention are analyzed and specific preventive measures are proposed.

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结果表明，所提出的风险免疫策略能有效地防范和控制无违约债券的利率风险。

The results show that the strategy of risk immunization proposed in this paper is very effective at the interest risk management of the default-free bond.

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因此，有必要对该禁令予以适当调整或解除，并辅之以特别限制条款，以有效防范道德风险的同时，补救该禁令对无民事行为能力人保护的不足。

Therefore, it is necessary to the proper adjustment or discharge, and complemented by the special limitation, to prevent moral hazard, remedy the ban on without human protection.

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